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The coevolution of supermassive black holes and their host galaxies represents a fundamental question in astrophysics. One approach to investigating this question involves comparing the star-formation rates (SFRs) of active galactic nuclei…

Astrophysics of Galaxies · Physics 2024-11-26 Bojun Zhang , Fan Zou , W. N. Brandt , Shifu Zhu , Nathan Cristello , Qingling Ni , Yongquan Xue , Zhibo Yu

We examine the relationship between star formation and AGN activity by constructing matched samples of local ($0<z<0.6$) radio-loud and radio-quiet AGN in the $\textit{Herschel}$-ATLAS fields. Radio-loud AGN are classified as…

Astrophysics of Galaxies · Physics 2015-08-19 G. Gurkan , M. J. Hardcastle , M. J. Jarvis , D. J. B. Smith , N. Bourne , L. Dunne , S. Maddox , R. J. Ivison , J. Fritz

We investigate radio-mode AGN activity among post-starburst galaxies from the Sloan Digital Sky Survey to determine whether AGN feedback may be responsible for the cessation of star formation. Based on radio morphology and radio-loudness…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Min-Su Shin , Michael A. Strauss , Rita Tojeiro

We examine the demographics of radio-emitting active galactic nuclei (AGN) in the local universe as a function of host galaxy properties, most notably both stellar mass and star formation rate. Radio AGN activity is theoretically implicated…

Astrophysics of Galaxies · Physics 2024-04-09 Arjun Suresh , Michael R. Blanton

Several studies support the existence of a link between the AGN and star formation activity. Radio jets have been argued to be an ideal mechanism for direct interaction between the AGN and the host galaxy. A drawback of previous surveys of…

Astrophysics of Galaxies · Physics 2017-08-02 E. Kalfountzou , J. A. Stevens , M. J. Jarvis , M. J. Hardcastle , D. Wilner , M. Elvis , M. J. Page , M. Trichas , D. J. B. Smith

We investigate the star formation properties of ~800 sources detected in one of the deepest radio surveys at 1.4 GHz. Our sample spans a wide redshift range (~0.1 - 4) and about four orders of magnitude in star formation rate (SFR). It…

Astrophysics of Galaxies · Physics 2015-09-09 M. Bonzini , V. Mainieri , P. Padovani , P. Andreani , S. Berta , M. Bethermin , D. Lutz , G. Rodighiero , D. Rosario , P. Tozzi , S. Vattakunnel

Maintenance-mode feedback from low-accretion rate AGN, manifesting itself observationally through radio-loudness, is invoked in all cosmological galaxy formation models as a mechanism that prevents excessive star-formation in massive…

We analyze the optical spectra of massive (log M*/Msun > 11.4) radio-loud galaxies at z~0.2 and z~0.6. By comparing stellar population parameters of these radio-loud samples with radio-quiet control samples, we investigate how the presence…

The effect of Active Galactic Nuclei (AGN) on their host galaxies -- in particular their levels of star formation -- remains one of the key outstanding questions of galaxy evolution. Successful cosmological models of galaxy evolution…

It has been speculated that low luminosity radio-loud AGN have the potential to serve as an important source of AGN feedback, and may be responsible for suppressing star-formation activity in massive elliptical galaxies at late times. As…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-17 K. McAlpine , M. J. Jarvis , D. G. Bonfield

AGN feedback is believed to play an important role in shaping a variety of observed galaxy properties, as well as the evolution of their stellar masses and star formation rates. In particular, in the current theoretical paradigm of galaxy…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Fabio Fontanot , Anna Pasquali , Gabriella De Lucia , Frank C. van den Bosch , Rachel S. Somerville , Xi Kang

Increasing evidence shows that AGN with radio detections have more perturbed ionized gas kinematics and higher outflow detection rates, suggesting a link between radio emission and these processes. In galaxies with weak or ambiguous AGN…

Astrophysics of Galaxies · Physics 2026-03-04 Marco Albán , Dominika Wylezalek , Pranav Kukreti , Rogemar A. Riffel , Rogerio Riffel

I briefly review the current status of observations of AGN-powered UV/optical light, starlight, dust and outflow phenomena in high-redshift powerful radio galaxies. The existing data are consistent with the hypothesis that powerful radio…

Astrophysics · Physics 2007-05-23 Arjun Dey

Nuclear starbursts and AGN activity are the main heating processes in luminous infrared galaxies (LIRGs) and their relationship is fundamental to understand galaxy evolution. In this paper, we study the star-formation and AGN activity of a…

We present a study of the evolution of the fraction of radio-loud active galactic nuclei (AGN) as a function of their host stellar mass. We make use of two samples of radio galaxies: one in the local universe, $0.01 < z < 0.3$, using a…

Astrophysics of Galaxies · Physics 2015-06-24 W. L. Williams , H. J. A. Röttgering

We investigate faint radio emission from low- to high-luminosity Active Galactic Nuclei (AGN) selected from the Sloan Digital Sky Survey (SDSS). Their radio properties are inferred by co-adding large ensembles of radio image cut-outs from…

Astrophysics · Physics 2008-11-26 W. H. de Vries , J. A. Hodge , R. H. Becker , R. L. White , D. J. Helfand

Radio-emitting active galactic nuclei (AGNs) are common in elliptical galaxies and AGN feedback is one of the possible mechanisms for regulating star formation in massive galaxies. It is unclear if all passive galaxy populations host radio…

Astrophysics of Galaxies · Physics 2025-07-16 Hei Yung Chan , Michael J. I. Brown

Discerning the exact nature of the sub-mJy radio population has been historically difficult due to the low luminosity of these sources at most wavelengths. Using deep ground based optical follow-up and observations from the Spitzer Space…

Astrophysics · Physics 2009-11-13 N. Seymour , T. Dwelly , D. Moss , I. McHardy , A. Zoghbi , G. Rieke , M. Page , A. Hopkins , N. Loaring

We explore radio and spectroscopic properties of a sample of 14 miniature radio galaxies, i.e. early-type core galaxies hosting radio-loud AGN of extremely low radio power, 10^(27-29) erg s^(-1) Hz^(-1) at 1.4 GHz. Miniature radio galaxies…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 Ranieri D. Baldi , Alessandro Capetti

We explore the cosmic evolution of radio AGN with low radio powers (L_1.4GHz < 5\times10^25 W/Hz) out to z=1.3 using to-date the largest sample of ~600 low luminosity radio AGN at intermediate redshift drawn from the VLA-COSMOS survey. We…

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